2D MXene-containing polymer electrolytes for all-solid-state lithium metal batteries

Abstract

2D MXenes in solid polymer electrolytes show high efficiency in ionic conductivity enhancement and lithium metal battery performance improvement.

MXene‐Based Mesoporous Nanosheets Toward Superior Lithium Ion Conductors

“…To facilitate Li + transportation in solid polymer electrolytes, one efficient strategy is adding inorganic fillers such as zero‐dimensional SiO 2 , TiO 2 , Al 2 O 3 , 1D Li 0.33 La 0.557 TiO 3 nanowires, and 2D graphene oxide and MXene into the polymer matrix, producing inorganic/polymer electrolytes . Such inorganic fillers usually enable to plasticize polymers, reducing polymer crystallinity and enhancing the molecular chain motion of the polymers .…”

“…Particularly, the fillers with abundant chemical functional groups (such as OH) can facilely combine with the ionic species via Lewis acid–base interactions, acquiring highly dissociated lithium salts, thereby greatly promoting the Li + transportation at inorganic filler/polymer matrix interfaces . Therefore, high surface area fillers with abundant functional groups such as graphene oxide, vermiculite sheets, and MXene‐Ti 3 C 2 are beneficial to the formation of highly conductive polymer electrolytes (≈10 −4 S cm −1 ) . For instance, in the case of adding emerging MXene‐Ti 3 C 2 in PEO electrolyte, the ionic conductivity can be improved to 7.0 × 10 −10 S cm −1 , five times than that of the pure PEO electrolyte (1.4 × 10 −10 S cm −1 ) .…”

“…Therefore, high surface area fillers with abundant functional groups such as graphene oxide, vermiculite sheets, and MXene‐Ti 3 C 2 are beneficial to the formation of highly conductive polymer electrolytes (≈10 −4 S cm −1 ) . For instance, in the case of adding emerging MXene‐Ti 3 C 2 in PEO electrolyte, the ionic conductivity can be improved to 7.0 × 10 −10 S cm −1 , five times than that of the pure PEO electrolyte (1.4 × 10 −10 S cm −1 ) . Moreover, to date, more than 20 MXenes with plentiful and tunable surface functional groups (OH, F, Cl) have been developed, providing a great opportunity toward various highly conductive MXene‐containing solid polymer electrolytes.…”

High Uptake and Fast Transportation of LiPF6 in a Porous Aromatic Framework for Solid‐State Li‐Ion Batteries

“…The voltage versus time profiles of the battery under each current density corresponding to the rate capacity test were shown in Figure e. The voltage profiles were very stable, and there was no obvious fluctuation under different current densities, indicating good circularity and stable interface of the battery . Figure f further compares the cycling performance LiFePO 4 ∥LiPF 6 @ PAF‐1∥Li cell and other SSLIBs that have been well studied. LiFePO 4 ∥LiPF 6 @PAF‐1∥Li cell exhibits high capacity with robust electrochemical stability and importantly, it sustained rigorous long‐term current density as high as 4C.…”

“…f) Cycling performance of Li/LiFePO 4 cells with other SSEs and LiPF 6 @PAF‐1 in long term cycles (first 100 cycles). (LLZO‐containing PCPSE, CPMEA‐LATP base PCPSE, Cathode‐supported PPAL, PEO 20 ‐LiTFSI‐MXene 0.02 , LPC@UM, PLLN …”